Below are a series of original drawings used some 50 to 60 years ago as teaching aids for entomology at the University of Illinois. They were rescued from Harker Hall, the old Law, then Chemistry, and later Entomology building, during its recent renovation. The original drawings are on canvas, approximately 1.0 by 1.5 meters and were drawn as a WPA project during the Depression. Many of them seem to be based (sometimes closely) on drawings found in "Destructive and Useful Insects" by C.L. Metcalf and W.P. Flint. The images below are mainly overviews of several of the more common insect orders (The taxonomic purist will note that some of the panels contain more than one order as we recognize them today. Errata are listed here).
Collembola (Springtails)
Thysanura (Silverfish)
Ephemeroptera (Mayflies)
Odonata (Dragonflies and damselflies)
Plecoptera (Stoneflies)
Orthoptera (Grasshoppers, Crickets, Katydids)
Dictyoptera (Cockroaches and Mantids)
Isoptera (Termites)
Dermaptera (Earwigs)
Thysanoptera (Thrips)
Hemiptera (Bugs)
Homoptera (Cicadas, hoppers, etc.)
Phthiraptera (Lice)
Coleoptera (Beetles)
Hymenoptera (Bees and wasps)
Neuroptera (Lacewings, etc)
Mecoptera (Scorpionflies)
Lepidoptera (Butterflies and moths)
Trichoptera (Caddisflies)
Diptera (Flies)
Siphonaptera (Fleas)
Department of Entomology at the University of Illinois.
Information provided by: http://www.life.uiuc.edu